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Originally Posted by Sccoupe
I've switched over to 50 foot holes to try and speed things up. Its just too time consuming with dropping and pulling pipe constantly. Two 90 foot holes, two 50 foot holes, and a 40 foot hole are drilled. The 40 footer finally done in the only core bit I have used. So not too bad for so much limestone drilling. Another bit is on order.
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The two 90 foot hole pipes have the pipe dropped in, but still no grouting. For the last 6 weeks or so, they have been taking in the heat from a 1 ton PTAC. The ducts from some rooms above my garage have been disconnected from the main heat pump and are running their own geothermal zone. Its all running fine with loop temps not going above 80F even with the A/C running constantly all day.
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The Grundfos circulator pump is doing its job. Its a simple 3 speed pump wired right to the compressor contactor. After much research, it seems that those flow centers are extremely over priced! Literally a tank, pump, and some fancy valves to make flushing easier. All of this can be done on the cheap and they are using the same type of pump i'm using at only 60 bucks. For $150 or so, there are variable speed pumps based on delta T, so one of these will be used for the 3 ton pump that will go in the main part of the house.
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As the drilling continues, the last part of the equation will be what kind of 3 ton heat pump to buy. Single stage PTAC's can be brought pretty cheap, though not as cheap as a diy conversion. This may be where some money needs spent for efficiency on a 2 stage pump with hot water heater. That's a big difference in cost though and it needs weighed out.
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Can't say that I blame you digging in lime stone rock and gravel makes drilling diy a mess and pain. Congrats on being able to do it your self that alone saved you a ton of money. Yea . Money spent now without inflation may be money earned in the future . Money seems to be everyone's shortcomings . I know it is one of my biggest.
Only bad thing with the 50 footers is they may not yield quite as much heat. I seem to have read less than 30 is the coldest . Then every so many feet it naturally rises. I looked on ac hackers diagram with the 17 feet holes. Obviously he hit rock unfortunately .